155936197 has 2 divisors, whose sum is σ = 155936198. Its totient is φ = 155936196.

The previous prime is 155936171. The next prime is 155936213. The reversal of 155936197 is 791639551.

155936197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132112036 + 23824161 = 11494^2 + 4881^2 .

It is an emirp because it is prime and its reverse (791639551) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155936197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155936117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77968098 + 77968099.

It is an arithmetic number, because the mean of its divisors is an integer number (77968099).

Almost surely, 2^155936197 is an apocalyptic number.

It is an amenable number.

155936197 is a deficient number, since it is larger than the sum of its proper divisors (1).

155936197 is an equidigital number, since it uses as much as digits as its factorization.

155936197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 255150, while the sum is 46.

The square root of 155936197 is about 12487.4415714349. The cubic root of 155936197 is about 538.2478612194.

The spelling of 155936197 in words is "one hundred fifty-five million, nine hundred thirty-six thousand, one hundred ninety-seven".